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arXiv 1508.04797gr-qc
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黑洞双星内旋:坍落分析

Black hole binary inspiral: Analysis of the plunge

Richard H. Price, Sourabh Nampalliwar, Gaurav Khanna

摘要:

双黑洞并合在“坍缩”过程中有一个引力波产生的高峰,即从早期的准圆运动到晚期的准正态振铃的转变。虽然数值相对论的进展提供了暴跌波形,仍然没有直观的或唯象的理解暴跌的早期和晚期相比较。在这里,我们取得了进展,在发展这样的理解,专注于激发准正规振铃(QNR)在暴跌。我们依赖于粒子微扰模型的线性数学的见解的极端质量限制。我们的分析,基于傅立叶域格林函数,和一个简单的初始模型,点附近的“光环”(圆形光子轨道)的运动学在确定QNR的激发发挥了至关重要的作用。这种见解,然后成功地解释史瓦西QNR发现的进化代码。最后,对光环的潜在重要性给出了唯象解释。

英文摘要:

Binary black hole coalescence has its peak of gravitational wave generation during the "plunge," the transition from quasicircular early motion to late quasinormal ringing. Although advances in numerical relativity have provided plunge waveforms, there is still no intuitive or phenomenological understanding of plungecomparable to that of the early and late stages. Here we make progress in developing such understanding by focusing on the excitation of quasinormal ringing (QNR) during the plunge. We rely on insights of the linear mathematics of the particle perturbation model for the extreme mass limit. Our analysis, based on the Fourier domain Green function, and a simple initial model, point to the crucial role played by the kinematics near the "light ring" (the circular photon orbit) in determining the excitation of QNR. That insight is then shown to successfully explain Schwarzschild QNR found with evolution codes. Lastly, a phenomenological explanation is given for the underlying importance of the light ring.

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